PlaySudoku.us
Hard · Puzzle #653
6
4
2
5
6
1
3
9
9
8
1
5
1
2
3
9
8
2
9
7
6
1
8
7
3
9
4
2
5
1
Backtracking — the algorithm most computers use to solve Sudoku — is a form of depth-first search with pruning.
Backtracking — the algorithm most computers use to solve Sudoku — is a form of depth-first search with pruning.
Backtracking — the algorithm most computers use to solve Sudoku — is a form of depth-first search with pruning.
Backtracking — the algorithm most computers use to solve Sudoku — is a form of depth-first search with pruning.